REV03097

• Permit No: C1983059
• IBM Index Class Name: Revision
• Doc Date: 12/21/1993
• Doc Name: ADEQUACY REVIEW MEMO
• From: DMG
• To: CHRISTINE JOHNSTON
• Type & Sequence: TR4
• Media Type: D
• Archive: No

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999
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, CO 80203
Phone: [phone]
FA%:13031832-8106
December 21, 1993
TO: Christine Johnston
FROM: Tony Waldron -~~
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Roy homer
Governor
Michael B Lonq
Division Director
RE: Terror Creek Company (C-83-059), Adequacy Review for TR-04
Per your request, I have reviewed Technical Revision 04 for
adequacy. The revision addresses the proposed sampling program to
determine whether or not selected soil type material will suffice
as suitable plant growth media. The material in question will come
from two sources, both of which are on the coal bench. As for the
proposed sampling program I have the following comments:
1. The placement of the sample holes can be random but should be
systematic enough to adequately represent the target areas. I
think this is what they have in mind but it should be verified.
2. The proposed sample plan calls for compositing the full depth
from various holes at each location for a total of eight
samples. The operator may also consider( not required) analyzing
one sample from each location at one foot intervals. The
intervals could be composited from several holes and condensed
to provide one sample. This would add a total of eight samples
to be analyzed. A reduced parameter list would be fine for these
interval samples(Ph, EC, SAR). This could help isolate any
unsuitable material.
The proposed analysis does not include fertility parameters
(N,P,K) but they might as well conduct these while doing the
rest of the tests. The fertility levels probably will not change
before reclamation is conducted and based on the results they
will be able to determine if they need to amend this growth
medium. Also, the test should include ~ Organic Matter and I
think they meant to test for Boron Not Barium if the pH is above
8.5.
4. The material balance (providing that this material is suitable)
will allow exactly 1.9 feet of cover to be placed on the
reclaimed area. The operator may want to commit to a lesser
depth to provide for shrink/swell and settling after placement.
Or you may want to make it clear that the depth will be checked
and verified at lay-down.
5. The TR states that 1.9 feet of growth media will provide enough